CVE-2024-56694 Information

Description

In the Linux kernel the following vulnerability has been resolved:

bpf: fix recursive lock when verdict program return SK_PASS

When the stream_verdict program returns SK_PASS it places the received skb into its own receive queue but a recursive lock eventually occurs leading to an operating system deadlock. This issue has been present since v6.9.

’’' sk_psock_strp_data_ready write_lock_bh(&sk->sk_callback_lock) strp_data_ready strp_read_sock read_sock -> tcp_read_sock strp_recv cb.rcv_msg -> sk_psock_strp_read now stream_verdict return SK_PASS without peer sock assign __SK_PASS = sk_psock_map_verd(SK_PASS NULL) sk_psock_verdict_apply sk_psock_skb_ingress_self sk_psock_skb_ingress_enqueue sk_psock_data_ready read_lock_bh(&sk->sk_callback_lock) <= dead lock

’''

This topic has been discussed before but it has not been fixed. Previous discussion: https://lore.kernel.org/all/6684a5864ec86_403d20898@john.notmuch

Reference

https://git.kernel.org/stable/c/01f1b88acfd79103da0610b45471f6c88ea98d72 https://git.kernel.org/stable/c/386efa339e08563dd33e83bc951aea5d407fe578 https://git.kernel.org/stable/c/6694f7acd625ed854bf6342926e771d65dad7f69 https://git.kernel.org/stable/c/8ca2a1eeadf09862190b2810697702d803ceef2d https://git.kernel.org/stable/c/da2bc8a0c8f3ac66fdf980fc59936f851a083561 https://git.kernel.org/stable/c/f84c5ef6ca23cc2f72f3b830d74f67944684bb05